Chemistry - Metallurgy Question with Solution | TestHub

(A) is incorrect: Silica (SiO₂) is added as a flux to remove iron impurities as iron silicate slag (FeSiO₃), not copper silicate.

(B) is correct: A green flame appears due to iron impurities, and its disappearance signifies that iron has been completely oxidized and removed.

(C) is correct: Active impurities (Fe, Ni, Zn) dissolve into the electrolyte solution, while noble metals (Au, Ag, Pt) settle down as anode mud.

(D) is incorrect: Roasting of copper pyrites (CuFeS₂) yields sulfides of copper and iron (Cu₂S and FeS), rather than cuprite (Cu₂O).